feat(command): dump Cluster-Peers to stderr with debug

Make it easier to debug sync cluster problem when debug is on by dumping
the cluster members.
fix(command): prefix curl debug with "Curl-Example"

let the user know what the curl field is for
fix(command): cleanup cannot sync error message
chore(command): use the long form to lookup peers arg

don't use the short form to lookup the arg. This makes it easier to know
what is being looked up.
Merge pull request #36 from philips/improved-debugging

Various cleanups to improve debug output